10-GB S STANDARD FIBER TRANSMISSION USING DIRECTLY MODULATED 1.55-MU-M QUANTUM-WELL DFB LASERS/

10-Gb/s long-haul transmission on standard single-mode fibers at 1.55 mu m with intensity modulated, low-chirp MQW DFB lasers is investigate d. Successful transmission is achieved by operating the laser at incre ased bias. Thus, the laser chirp acts favorably on the propagation aft er an initial distance of 30 km in the fiber. A detailed system evalua tion with an optical preamplified PIN-receiver, reveals a negligible d ispersion power penalty for transmission distances between 35 and 70 k m. The power penalty, mainly caused by a lower extinction ratio, must be accepted.